Remove and update documentation

This change is a verbatim part of Dmitry's changes to remove support
for non-Linux architectures.

* PORTING: Deleted.
* INSTALL: Modified.
* README: Modified.
* strace.1: Modified: bugs should be reported to mailing list, not Debian.
* strace.spec: do not install PORTING file.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/README b/README
index 51490cb..244a5c3 100644
--- a/README
+++ b/README
@@ -1,31 +1,17 @@
-This is strace 4.0, a system call tracer for SunOS 4.x, Linux, System
-V release 4, Solaris 2.x and Irix 5.x.  strace is released under a
-Berkeley-style license at the request of Paul Kranenburg; see the file
-COPYRIGHT for details.
+This is strace, a system call tracer for Linux.
 
-Read the INSTALL file for generic instructions on how to install
-strace.  If configure cannot guess your system configuration, you can
-specify it on the command line after the other options like this:
+strace is released under a Berkeley-style license at the request
+of Paul Kranenburg; see the file COPYRIGHT for details.
 
-	./configure --prefix=/usr i486-linux
+See the file CREDITS for a list of authors and other contributors.
 
-A single sunos4.1 binary should work on all the sun4, sun4c and sun4m
-kernel architectures.  Let me know if sun4d doesn't work.  Other
-i486-*-sysv4 systems may work with little or no tweaking.
+See the file INSTALL for compilation and installation instructions.
 
 See the file NEWS for information on what has changed in recent
 versions.
 
-See the file PORTING if you like strace but it doesn't work on an
-operating system you use frequently.
-
-See the file CREDITS to see who has contributed to strace.
-
-See the file TODO if you feel like helping out.
-
 You can get the latest version of strace from its homepage at
 http://sourceforge.net/projects/strace/ .
 
 Please send bug reports and enhancements to the strace
-mailinglist at strace-devel@lists.sourceforge.net, or directly to
-Wichert Akkerman <wakkerma@debian.org>
+mailinglist at strace-devel@lists.sourceforge.net.